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Edit File : process-controller.rb \| Size : 7.46 KB
# # shell/process-controller.rb - # $Release Version: 0.7 $ # $Revision: 47284 $ # by Keiju ISHITSUKA(keiju@ruby-lang.org) # # -- # # # require "forwardable" require "thread" require "sync" class Shell class ProcessController @ProcessControllers = {} @ProcessControllersMonitor = Mutex.new @ProcessControllersCV = ConditionVariable.new @BlockOutputMonitor = Mutex.new @BlockOutputCV = ConditionVariable.new class << self extend Forwardable def_delegator("@ProcessControllersMonitor", "synchronize", "process_controllers_exclusive") def active_process_controllers process_controllers_exclusive do @ProcessControllers.dup end end def activate(pc) process_controllers_exclusive do @ProcessControllers[pc] \|\|= 0 @ProcessControllers[pc] += 1 end end def inactivate(pc) process_controllers_exclusive do if @ProcessControllers[pc] if (@ProcessControllers[pc] -= 1) == 0 @ProcessControllers.delete(pc) @ProcessControllersCV.signal end end end end def each_active_object process_controllers_exclusive do for ref in @ProcessControllers.keys yield ref end end end def block_output_synchronize(&b) @BlockOutputMonitor.synchronize(&b) end def wait_to_finish_all_process_controllers process_controllers_exclusive do while !@ProcessControllers.empty? Shell::notify("Process finishing, but active shell exists", "You can use Shell#transact or Shell#check_point for more safe execution.") if Shell.debug? for pc in @ProcessControllers.keys Shell::notify(" Not finished jobs in "+pc.shell.to_s) for com in pc.jobs com.notify(" Jobs: %id") end end end @ProcessControllersCV.wait(@ProcessControllersMonitor) end end end end # for shell-command complete finish at this process exit. USING_AT_EXIT_WHEN_PROCESS_EXIT = true at_exit do wait_to_finish_all_process_controllers unless $@ end def initialize(shell) @shell = shell @waiting_jobs = [] @active_jobs = [] @jobs_sync = Sync.new @job_monitor = Mutex.new @job_condition = ConditionVariable.new end attr_reader :shell def jobs jobs = [] @jobs_sync.synchronize(:SH) do jobs.concat @waiting_jobs jobs.concat @active_jobs end jobs end def active_jobs @active_jobs end def waiting_jobs @waiting_jobs end def jobs_exist? @jobs_sync.synchronize(:SH) do @active_jobs.empty? or @waiting_jobs.empty? end end def active_jobs_exist? @jobs_sync.synchronize(:SH) do @active_jobs.empty? end end def waiting_jobs_exist? @jobs_sync.synchronize(:SH) do @waiting_jobs.empty? end end # schedule a command def add_schedule(command) @jobs_sync.synchronize(:EX) do ProcessController.activate(self) if @active_jobs.empty? start_job command else @waiting_jobs.push(command) end end end # start a job def start_job(command = nil) @jobs_sync.synchronize(:EX) do if command return if command.active? @waiting_jobs.delete command else command = @waiting_jobs.shift return unless command end @active_jobs.push command command.start # start all jobs that input from the job for job in @waiting_jobs.dup start_job(job) if job.input == command end end end def waiting_job?(job) @jobs_sync.synchronize(:SH) do @waiting_jobs.include?(job) end end def active_job?(job) @jobs_sync.synchronize(:SH) do @active_jobs.include?(job) end end # terminate a job def terminate_job(command) @jobs_sync.synchronize(:EX) do @active_jobs.delete command ProcessController.inactivate(self) if @active_jobs.empty? command.notify("start_job in terminate_job(%id)", Shell::debug?) start_job end end end # kill a job def kill_job(sig, command) @jobs_sync.synchronize(:EX) do if @waiting_jobs.delete command ProcessController.inactivate(self) return elsif @active_jobs.include?(command) begin r = command.kill(sig) ProcessController.inactivate(self) rescue print "Shell: Warn: $!\n" if @shell.verbose? return nil end @active_jobs.delete command r end end end # wait for all jobs to terminate def wait_all_jobs_execution @job_monitor.synchronize do begin while !jobs.empty? @job_condition.wait(@job_monitor) for job in jobs job.notify("waiting job(%id)", Shell::debug?) end end ensure redo unless jobs.empty? end end end # simple fork def sfork(command) pipe_me_in, pipe_peer_out = IO.pipe pipe_peer_in, pipe_me_out = IO.pipe pid = nil pid_mutex = Mutex.new pid_cv = ConditionVariable.new Thread.start do ProcessController.block_output_synchronize do STDOUT.flush ProcessController.each_active_object do \|pc\| for jobs in pc.active_jobs jobs.flush end end pid = fork { Thread.list.each do \|th\| th.kill unless Thread.current == th end STDIN.reopen(pipe_peer_in) STDOUT.reopen(pipe_peer_out) ObjectSpace.each_object(IO) do \|io\| if ![STDIN, STDOUT, STDERR].include?(io) io.close unless io.closed? end end yield } end pid_cv.signal pipe_peer_in.close pipe_peer_out.close command.notify "job(%name:##{pid}) start", @shell.debug? begin _pid = nil command.notify("job(%id) start to waiting finish.", @shell.debug?) _pid = Process.waitpid(pid, nil) rescue Errno::ECHILD command.notify "warn: job(%id) was done already waitpid." _pid = true ensure command.notify("Job(%id): Wait to finish when Process finished.", @shell.debug?) # when the process ends, wait until the command terminates if USING_AT_EXIT_WHEN_PROCESS_EXIT or _pid else command.notify("notice: Process finishing...", "wait for Job[%id] to finish.", "You can use Shell#transact or Shell#check_point for more safe execution.") redo end @job_monitor.synchronize do terminate_job(command) @job_condition.signal command.notify "job(%id) finish.", @shell.debug? end end end pid_mutex.synchronize do while !pid pid_cv.wait(pid_mutex) end end return pid, pipe_me_in, pipe_me_out end end end Back

Edit File : process-controller.rb | Size : 7.46 KB

#
#   shell/process-controller.rb -
#       $Release Version: 0.7 $
#       $Revision: 47284 $
#       by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#
require "forwardable"

require "thread"
require "sync"

class Shell
  class ProcessController

@ProcessControllers = {}
    @ProcessControllersMonitor = Mutex.new
    @ProcessControllersCV = ConditionVariable.new

@BlockOutputMonitor = Mutex.new
    @BlockOutputCV = ConditionVariable.new

class << self
      extend Forwardable

def_delegator("@ProcessControllersMonitor",
                    "synchronize", "process_controllers_exclusive")

def active_process_controllers
        process_controllers_exclusive do
          @ProcessControllers.dup
        end
      end

def activate(pc)
        process_controllers_exclusive do
          @ProcessControllers[pc] ||= 0
          @ProcessControllers[pc] += 1
        end
      end

def inactivate(pc)
        process_controllers_exclusive do
          if @ProcessControllers[pc]
            if (@ProcessControllers[pc] -= 1) == 0
              @ProcessControllers.delete(pc)
              @ProcessControllersCV.signal
            end
          end
        end
      end

def each_active_object
        process_controllers_exclusive do
          for ref in @ProcessControllers.keys
            yield ref
          end
        end
      end

def block_output_synchronize(&b)
        @BlockOutputMonitor.synchronize(&b)
      end

def wait_to_finish_all_process_controllers
        process_controllers_exclusive do
          while !@ProcessControllers.empty?
            Shell::notify("Process finishing, but active shell exists",
                          "You can use Shell#transact or Shell#check_point for more safe execution.")
            if Shell.debug?
              for pc in @ProcessControllers.keys
                Shell::notify(" Not finished jobs in "+pc.shell.to_s)
                for com in pc.jobs
                  com.notify("  Jobs: %id")
                end
              end
            end
            @ProcessControllersCV.wait(@ProcessControllersMonitor)
          end
        end
      end
    end

# for shell-command complete finish at this process exit.
    USING_AT_EXIT_WHEN_PROCESS_EXIT = true
    at_exit do
      wait_to_finish_all_process_controllers unless $@
    end

def initialize(shell)
      @shell = shell
      @waiting_jobs = []
      @active_jobs = []
      @jobs_sync = Sync.new

@job_monitor = Mutex.new
      @job_condition = ConditionVariable.new
    end

attr_reader :shell

def jobs
      jobs = []
      @jobs_sync.synchronize(:SH) do
        jobs.concat @waiting_jobs
        jobs.concat @active_jobs
      end
      jobs
    end

def active_jobs
      @active_jobs
    end

def waiting_jobs
      @waiting_jobs
    end

def jobs_exist?
      @jobs_sync.synchronize(:SH) do
        @active_jobs.empty? or @waiting_jobs.empty?
      end
    end

def active_jobs_exist?
      @jobs_sync.synchronize(:SH) do
        @active_jobs.empty?
      end
    end

def waiting_jobs_exist?
      @jobs_sync.synchronize(:SH) do
        @waiting_jobs.empty?
      end
    end

# schedule a command
    def add_schedule(command)
      @jobs_sync.synchronize(:EX) do
        ProcessController.activate(self)
        if @active_jobs.empty?
          start_job command
        else
          @waiting_jobs.push(command)
        end
      end
    end

# start a job
    def start_job(command = nil)
      @jobs_sync.synchronize(:EX) do
        if command
          return if command.active?
          @waiting_jobs.delete command
        else
          command = @waiting_jobs.shift

return unless command
        end
        @active_jobs.push command
        command.start

# start all jobs that input from the job
        for job in @waiting_jobs.dup
          start_job(job) if job.input == command
        end
      end
    end

def waiting_job?(job)
      @jobs_sync.synchronize(:SH) do
        @waiting_jobs.include?(job)
      end
    end

def active_job?(job)
      @jobs_sync.synchronize(:SH) do
        @active_jobs.include?(job)
      end
    end

# terminate a job
    def terminate_job(command)
      @jobs_sync.synchronize(:EX) do
        @active_jobs.delete command
        ProcessController.inactivate(self)
        if @active_jobs.empty?
          command.notify("start_job in terminate_job(%id)", Shell::debug?)
          start_job
        end
      end
    end

# kill a job
    def kill_job(sig, command)
      @jobs_sync.synchronize(:EX) do
        if @waiting_jobs.delete command
          ProcessController.inactivate(self)
          return
        elsif @active_jobs.include?(command)
          begin
            r = command.kill(sig)
            ProcessController.inactivate(self)
          rescue
            print "Shell: Warn: $!\n" if @shell.verbose?
            return nil
          end
          @active_jobs.delete command
          r
        end
      end
    end

# wait for all jobs to terminate
    def wait_all_jobs_execution
      @job_monitor.synchronize do
        begin
          while !jobs.empty?
            @job_condition.wait(@job_monitor)
            for job in jobs
              job.notify("waiting job(%id)", Shell::debug?)
            end
          end
        ensure
          redo unless jobs.empty?
        end
      end
    end

# simple fork
    def sfork(command)
      pipe_me_in, pipe_peer_out = IO.pipe
      pipe_peer_in, pipe_me_out = IO.pipe

pid = nil
      pid_mutex = Mutex.new
      pid_cv = ConditionVariable.new

Thread.start do
        ProcessController.block_output_synchronize do
          STDOUT.flush
          ProcessController.each_active_object do |pc|
            for jobs in pc.active_jobs
              jobs.flush
            end
          end

pid = fork {
            Thread.list.each do |th|
              th.kill unless Thread.current == th
            end

STDIN.reopen(pipe_peer_in)
            STDOUT.reopen(pipe_peer_out)

ObjectSpace.each_object(IO) do |io|
              if ![STDIN, STDOUT, STDERR].include?(io)
                io.close unless io.closed?
              end
            end

yield
          }
        end
        pid_cv.signal

pipe_peer_in.close
        pipe_peer_out.close
        command.notify "job(%name:##{pid}) start", @shell.debug?

begin
          _pid = nil
          command.notify("job(%id) start to waiting finish.", @shell.debug?)
          _pid = Process.waitpid(pid, nil)
        rescue Errno::ECHILD
          command.notify "warn: job(%id) was done already waitpid."
          _pid = true
        ensure
          command.notify("Job(%id): Wait to finish when Process finished.", @shell.debug?)
          # when the process ends, wait until the command terminates
          if USING_AT_EXIT_WHEN_PROCESS_EXIT or _pid
          else
            command.notify("notice: Process finishing...",
                           "wait for Job[%id] to finish.",
                           "You can use Shell#transact or Shell#check_point for more safe execution.")
            redo
          end

@job_monitor.synchronize do
            terminate_job(command)
            @job_condition.signal
            command.notify "job(%id) finish.", @shell.debug?
          end
        end
      end

pid_mutex.synchronize do
        while !pid
          pid_cv.wait(pid_mutex)
        end
      end

return pid, pipe_me_in, pipe_me_out
    end
  end
end

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